Entanglement and dynamics of spin-chains in periodically-pulsed magnetic fields: accelerator modes

Abstract

We study the dynamics of a single excitation in a Heisenberg spin-chain subjected to a sequence of periodic pulses from an external, parabolic, magnetic field. We show that, for experimentally reasonable parameters, a pair of counter-propagating coherent states are ejected from the centre of the chain. We find an illuminating correspondence with the quantum time evolution of the well-known paradigm of quantum chaos, the Quantum Kicked Rotor (QKR). From this we can analyse the entanglement production and interpret the ejected coherent states as a manifestation of so-called `accelerator modes' of a classically chaotic system.

5 pages, 2 figures; minor corrections, tidied presentation

References in corpus (1)

• The Propagation of Quantum Information Through a Spin System

Cited by in corpus (7)

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• Entanglement propagation through spin chains in the presence of a staggered magnetic field
• Quantum transport and spin dynamics on shearless tori